JSP XMLHttpRequest動(dòng)態(tài)無(wú)刷新及其中文亂碼處理

2020-07-27 21:40:52

字體：大中小

供稿：網(wǎng)友

1.在頁(yè)面的<script type="text/JavaScript" >內(nèi)加入
//無(wú)刷新請(qǐng)求的xmlhttp請(qǐng)求
var http_request=false;
function createRequest(url)
{
http_request = false;
if (window.XMLHttpRequest) { // Mozilla, Safari,...
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {
http_request.overrideMimeType('text/html');
}
} else if (window.ActiveXObject) { // IE
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) {
alert('不能創(chuàng)建XMLHTTP實(shí)例!');
return false;
}
http_request.onreadystatechange=alertContents;
http_request.open("POST",url,true);
http_request.send(null);
}
2.調(diào)用--在js調(diào)用請(qǐng)求【CONTROL為servlet配置的url-mapping,傳參跟一般url傳參一樣】
createRequest('CONTROL'+'?cmd=listen');
3.在servlet中處理【中文亂碼問(wèn)題】
PrintWriter out;
response.setContentType("html/text");//此5行必備，用于輸出中文，否則亂碼
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control","no-cache");
out=response.getWriter();
out.println("對(duì)不起，系統(tǒng)忙，請(qǐng)稍后再試！"); //為返回的響應(yīng)結(jié)果，在頁(yè)面直接以alert()顯示

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